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Yes, we've had that problem too. I believe the solution was to copy/paste the page and remove the original page. And the problem went away =)
Seems there is a hiccup somewhere in the scheduler/delayed publishing job that can't be reset by normal means. You also might want to check out the SP1 for CMS 6 R2 in which EPiServer has fixed a number of issues with, among other things, the scheduler.
Has anyone else every seen the delayed publishing job run haywire? I have a client who has the job scheduled to run every 15 minutes. Whenever he scheduled a page version for delayed publishing, this job publishes the new version on schedule, then continues to publish a new version off the page, every 15 minutes, ad infinitem.
Is there any kind of known issue here?